Benchmark: Map Includes vs Some Simplified

Script Preparation code:

var data = []

for (let i = 0; i < 5000; ++i) data.push({ username: 'toto' })
data.push({ username: 'tata' })
for (let i = 0; i < 2500; ++i) data.push({ username: 'toto' })

Tests:

Map Includes
data.map(({username}) => username).includes("tata");
Some
data.some(({username}) => username == "tata");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map Includes
Some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser/OS: Firefox 115 on Windows

View result in a separate tab

Test name	Executions per second
Map Includes	9853.1 Ops/sec
Some	26990.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark is designed to compare two different ways of checking if an element exists in an array: using `Array.includes()` versus `Array.some()`. The test case creates a large array of 7,500 objects with a single property "username" and pushes it into the array. Then, it checks if a specific username ("tata") is included in the array using both methods.

**Comparison Options**

The two comparison options are:

1. `Array.includes()`
2. `Array.some()`

**Pros and Cons of Each Approach**

1. **`Array.includes()`**:
	* Pros:
		+ More readable and concise code
		+ Faster lookup time (average O(1) complexity)
	* Cons:
		+ Requires the element to be an exact match (no partial matches are returned)
2. **`Array.some()`**:
	* Pros:
		+ Allows for partial matches
		+ More flexible, as it can be used with other array methods like `every()`
	* Cons:
		+ Slower lookup time (average O(n) complexity), making it less suitable for large arrays

**Library and Syntax**

In this benchmark, the `Array` object is being tested. The `some()` method is a part of the ECMAScript standard, introduced in ECMAScript 1999.

**Special JS Feature/Syntax**

None mentioned.

**Other Alternatives**

For checking if an element exists in an array, other alternatives include:

1. **Using `Array.prototype.includes()` with a callback function**: This allows for more flexibility and can be used to check for partial matches.
```javascript
data.some((element) => {
  return typeof element === 'object' && element.username === 'tata';
});
```
2. **Using `Array.prototype.find()` or `Array.prototype.findIndex()`**: These methods are more modern and offer better performance, but may not be supported in older browsers.

**Benchmark Preparation Code**

The script preparation code creates a large array of 7,500 objects with a single property "username" and pushes it into the array:
```javascript
var data = [];

for (let i = 0; i < 5000; ++i) {
  data.push({ username: 'toto' });
}

data.push({ username: 'tata' });

for (let i = 0; i < 2500; ++i) {
  data.push({ username: 'toto' });
}
```
The HTML preparation code is empty, indicating that no HTML-specific code is being used in this benchmark.

Related benchmarks:

Map Includes vs Some Simplified (version: 0)

Comparing performance of: Map Includes vs Some

Created: 2 years ago by: Guest

Jump to the latest result

Map Includes

Some

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):